PD One: Federation Sourcebook 1994

The original Prime Directive (called Prime Directive One by some) expanded its horizons with this sourcebook. New character types, new skills, more equipment, new species, and lots of information, especially about the Vulcans and their psionic skills and disciplines. There's even a rundown of the important crew members aboard the USS Agincourt in Y172. You will need a copy of the Prime Directive Rulebook if you want to play the game, but there's lots to be learned about the Star Fleet Universe by simply browsing. Written by Timothy D. Olsen / Mark Costello